中文摘要：

本文提出了两种基于变量节点可靠度的LDPC解码算法.第一,针对传统的可靠度判决算法会产生比较严重的误判现象,导致译码性能降低.本文提出了一种改进的可靠度判决算法,它降低了变量节点的误判概率.在AWGN和瑞利信道仿真中,性能都有显著的提高,性能超过了标准BP算法.第二,提出了分层可靠度算法.和标准BP算法相比较,性能提高了0.1dB,收敛速度提高了一倍,计算复杂度降低大约65%.

英文摘要：

In the paper,two LDPC decoding algorithms based on reliability are proposed.First,the conventional early detection method is poor performance due to misjudgment.A new early detection method is proposed,which reduces the probability of misjudgment and lead to performance improvement. At AWGN and Rayleigh fading channel simulation,the performance of the new algorithm exceed standard BP algorithm.Second,the layered reliability decoding algorithm is proposed.Compared with standard BP algorithm, the performance is increased by 0.1dB,velocity of the convergence is twice faster and computational complexity is decreased by 65%.